title: Narrow terahertz attenuation signatures in Bacillus thuringiensis.
abstract: Terahertz absorption signatures from culture-cultivated Bacillus thuringiensis were measured with a THz photomixing spectrometer operating from 400 to 1200 GHz. We observe two distinct signatures centered at ∼955 and 1015 GHz, and attribute them to the optically coupled particle vibrational resonance (surface phonon-polariton) of Bacillus spores. This demonstrates the potential of the THz attenuation signatures as "fingerprints" for label-free biomolecular detection.
authors.affiliation: Terahertz Sensor Laboratory, Depts. of Physics and Electrical Engineering, Wright State University, Dayton, OH, USA, 45435. weidong.zhang@wright.edu.
authors.forename: Weidong
authors.initials: W
authors.lastname: Zhang
authors.forename: Elliott R
authors.initials: ER
authors.lastname: Brown
authors.forename: Leamon
authors.initials: L
authors.lastname: Viveros
authors.forename: Kellie P
authors.initials: KP
authors.lastname: Burris
authors.forename: C Neal
authors.initials: CN
authors.lastname: Stewart
mesh_terms: D001413:Bacillus thuringiensis / Q000737:chemistry* / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D013171:Spores, Bacterial / Q000737:chemistry* / Q000648:ultrastructure; D055068:Terahertz Spectroscopy / Q000295:instrumentation / Q000379:methods*; D014732:Vibration
keywords: Bacillus thuringiensis; Terahertz; spectroscopy; spore; surface mode; vegetative cells